商丘紫外线指数变化规律及气象因子影响分析

利用2003年4月至2006年6月商丘市气象台观测到的太阳紫外线指数资料及总云量、能见度、气温和相对湿度资料,分析了商丘市区紫外线指数的月、日变化规律以及气象因子与紫外线指数的关系。结果表明:①商丘紫外线指数1～2月和11～12月小,3～10月大,7～8月最大。②紫外线指数的日变化规律显著,基本上遵循正态分布,一天中辐射最强的时段在11:00～14:00,紫外线指数基本在6以上,辐射等级超过3级,紫外线照射强度中等以上。③紫外线指数与总云量、能见度、气温和相对湿度有较好的相关性。14:00的紫外线指数与同时次的总云量呈反相关,相关系数为-0.57;与能见度呈正相关,相关系数为0.64;与气温呈正相关,相关系数为0.46;与相对湿度呈反相关,相关系数为-0.8。

Variation Regularity of Ultraviolet Radiation Index and Its Relation with Meteorological Elements in Shangqiu

On the basis of the ultraviolet(UV)radiation index and meteorological data from April of 2003 to June of 2006 from Shangqiu,the monthly variation and daily variation of UV index in Shangqiu are analyzed,and the correlation coefficients between UV index and total cloud amount,visibility,temperature and relative humidity are calculated.The results show that:(1)the maximum UV index was in July and August,and the minimum was in January and February;(2)the daily variation of UV index followed the normal distribution,and the strongest period was from 11:00 to 14:00,in which the UV index was higher than 6;(3)the UV index showed good correlation with total cloud amount,visibility,temperature and relative humidity.